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Old 18 Feb 2007, 08:37 PM   #5
hadaso
The "e" in e-mail
 
Join Date: Oct 2002
Location: Holon, Israel.
Posts: 4,507
When a user is using a forwarding service then there is a specific SMTP envelope rcpt address the user set at the forwarder to forward to. I have several forwarders and each forwards to a specific subdomain@alias address. It would be helpful if there was a way for a user to declare that a certain incoming address is expecting mail from a certain forwarding host, and then trust the next received headers from these hosts when they send to the particular address (though I'm not sure how easy it is to implement. Most forwarding services I use insert several "Received" headers for several internal transfers.

SpamCop has their "mailhosts" configuration system for making their system learn about the forwarders each user uses, but I guess parsing "Received" headers is their specialty.
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